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Kernel: Add Region helpers for accessing underlying physical pages

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Since a Region is basically a view into a potentially larger VMObject,
it was always necessary to include the Region starting offset when
accessing its underlying physical pages.

Until now, you had to do that manually, but this patch adds a simple
Region::physical_page() for read-only access and a physical_page_slot()
when you want a mutable reference to the RefPtr<PhysicalPage> itself.

A lot of code is simplified by making use of this.
This commit is contained in:
Andreas Kling
2020-04-28 16:19:50 +02:00
parent 8a417c311f
commit 9c856811b2
8 changed files with 64 additions and 48 deletions
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7
Kernel/FileSystem/ProcFS.cpp
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@@ -319,11 +319,10 @@ Optional<KBuffer> procfs$pid_vm(InodeIdentifier identifier)
StringBuilder pagemap_builder;
for (size_t i = 0; i < region.page_count(); ++i) {
auto page_index = region.first_page_index() + i;
auto& physical_page_slot = region.vmobject().physical_pages()[page_index];
if (!physical_page_slot)
auto* page = region.physical_page(i);
if (!page)
pagemap_builder.append('N');
else if (physical_page_slot == MM.shared_zero_page())
else if (page->is_shared_zero_page())
pagemap_builder.append('Z');
else
pagemap_builder.append('P');